Iran
Reza Proof 1/2 Rial SH 1310 (1931) PR63 PCGS, KM1128 (unlisted in Proof). Highly reflective in the fields, with light tone on each side and perhaps a light partial coating of lacquer from the mint. Extremely rare as a proof, this being the only example we've been able to find, with no other denominations of the same date appearing in archived auction sales or in either the PCGS or NGC population reports.
HID02901242017
Estimate: 600-900 USD